<template>
	<view>
		<view class="search-box">
			<uni-search-bar placeholder="请输入搜索内容" @input="input" :radius="100" cancelButton="none" :focus="true"></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length!==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="25" @click="clean"></uni-icons>
			</view>
			<!-- 列表区 -->
			<view class="history-list">
				<uni-tag :text='item' v-for="(item,index) in histories" :key="index" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
				kw:'',
				//搜索的结果列表
				searchResults:[],
				// 搜索历史的数组
				historyList:[]
			};
		},
		onLoad(){//页面启动时自动加载存储化的数据
			this.historyList=JSON.parse(uni.getStorageSync('kw')||'[]')
		},
		methods:{
			//input输入事件的处理函数
			input(e){
				clearTimeout(this.timer)
				this.timer= setTimeout(()=>{
					this.kw=e
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				//判断关键词是否为空
				if(this.kw.length===0){
					this.searchResults=[]
					return
				}
				const {data:res}= await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				if(res.meta.status !==200) return uni.$showMsg()
				this.searchResults=res.message
				this.saveSearchHistory()
			},
			gotoDetail(item){
				console.log(item.goods_id)
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
				})
			},
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				 const set=new Set(this.historyList)
				 set.delete(this.kw)
				 set.add(this.kw)
				 this.historyList=Array.from(set)
				 
				 // 对搜索历史数据进行持久化的存储
				 uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList=[]
				// 清空持久化存储的数据
				uni.removeStorageSync('kw')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query=' + kw
					
				})
				console.log(kw)
			}
		},
		computed:{
			histories(){
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box{
		position: sticky;
		top:0;
		z-index: 999;
	}
	.sugg-list{
		padding: 0 5px;
		.sugg-item{
			display: flex;
			align-items: center;
			justify-content: space-between;
			font-size: 14px;
			padding: 10px 0;
			border-bottom: 1px solid #efefef;
			.goods-name{
				white-space: nowrap;//不换行
				overflow: hidden;
				text-overflow: ellipsis;//溢出的内容用...代替
			}
		}
	}
	
	.history-box{
		padding: 0 5px;
		.history-title{
			display: flex;
			justify-content: space-between;
			height: 40px;
			align-items: center;
			font-size: 14px;
			border-bottom: 1px solid #efefef;
		}
		.history-list{
			display: flex;
			flex-wrap: wrap;
			
			.uni-tag{//uni-ui提供的标签也是样式的类名
				margin-top: 5px;
				margin-right: 5px;
				background-color: #efefef;
				color: black;
			}
		}
	}
</style>
